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Fair Value (Reconciliation Of Level 3 Input For Financial Instruments Measured On Recurring Basis) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Investments, Fair Value Disclosure $ 0   $ 0     $ 0    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Included in other comprehensive income 1 $ 13 $ 6 $ 28        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Reconciliation Of Level 3 Input For Financial Instruments Measured On Recurring Basis    
The tables below present a reconciliation of the beginning and ending balances of the Level 3 inputs for the three-month and nine-month periods ended September 30, 2021 and 2020, for financial instruments measured on a recurring basis and classified as Level 3:

Level 3 Fair Value Measurements
Three months ended September 30, 2021 and 2020
(In thousands)Equity
Securities		Fair value
swap
Balance at July 1, 2021$490 $(226)
Total gains   
Included in other income1 — 
Balance at September 30, 2021$491 $(226)
Balance at July 1, 2020$471 $(226)
Total gains  
Included in other income13 — 
Balance at September 30, 2020$484 $(226)

Level 3 Fair Value Measurements
Nine months ended September 30, 2021 and 2020
(In thousands)Equity
Securities		Fair value
swap
Balance at January 1, 2021$485 $(226)
Total gains  
Included in other income6 — 
Balance at September 30, 2021$491 $(226)
Balance at January 1, 2020$456 $(226)
Total gains  
Included in other income28 — 
Balance at September 30, 2020$484 $(226)
          
Fair Value, Recurring [Member] | Equity Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Investments, Fair Value Disclosure 2,070   $ 2,070     2,511    
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Investments, Fair Value Disclosure 491   491     485    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Balance, beginning 491 484 491 484 $ 490 485 $ 471 $ 456
Balance, ending 491 484 491 484 490 485 471 456
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Swap [Member]                
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Balance, beginning (226) (226) (226) (226) (226) (226) (226) (226)
Included in other comprehensive income   0   0        
Balance, ending $ (226) $ (226) $ (226) $ (226) $ (226) $ (226) $ (226) $ (226)